RA-TECH Upgrade kit

I was wondering if the RA-TECH hardkick valve will increase the recoil on the current KWA Umarex mp7 or is it just a way for the "original" KSC mp7 to get up to par with the KWA Umarex version?
I'm referencing this YouTube video.

The RA Tech was specifically made for the "taiwan version" that can also be retrofitted with all MP7 with the same design. The "taiwan version" in it's stock cofiguration kicks up a bit more than the KWA. So installing it in the KWA will surely increase the "kick", question is will it also invalidate the warranty?

You are adding weights on the bolt carrier so yes it will increase recoil. However, changing out part inside the gun will change the over-all dynamic of the gas system. Increase recoil will come as cost to other performance specs like decrease gas efficiency and lower ROF. The worst will crack the cylinder because the weights add delay of the blow back thus increasing the pressure of the cylinder.

Another important thing of the bolt carrier assembly is secure by four temper proof screws. Disassemble the bolt carrier will probably strip or destroy the screws plus the retainer in the front will also need to be replace as well.

Increased WEIGHT is another spec that the airsoft community tends to value and real steel doesn't (for obvious reasons). Airsoft (certain aspects) is all about replication but are diametrically opposed to each other and I think its funny. Hey, I'm always looking to increase the recoil of my GBB's. The KWA mp7 though, seems to have struck a nice balance between realism and functionality. I'm looking forward to an OD KMP9 when it comes out!!! AND the LM4!

Increased WEIGHT is another spec that the airsoft community tends to value and real steel doesn't (for obvious reasons). Airsoft (certain aspects) is all about replication but are diametrically opposed to each other and I think its funny. Hey, I'm always looking to increase the recoil of my GBB's. The KWA mp7 though, seems to have struck a nice balance between realism and functionality. I'm looking forward to an OD KMP9 when it comes out!!! AND the LM4!

I agree with tiger.

I am sending my KWA MP7 in to KWA to have fixed and I am going to just leave it stock.

KWA MP7 and KWA P226...I will just run around and ghost ppl when I play airsoft....LOL